<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>css学习</title>
    <style>
        .div111 {
            /* border-color: green;
            border-style: solid;
            border-width: 2px; */
            border: 2px, solid, green;
            height: 100px;
            width: 500px;
        }
        span {
            display: block;
            border: 2px, solid, green;
            height: 100px;
            width: 500px;
        }
    </style>
</head>
<body>
    <div class="div111">div111</div>
    <divc class="div222">div222</div>
    <div><a href="#">div333</a></div>
    <span>span111</span><br/>
    <input type="button" value="提交">
</body>
</html>